JoltTransformJSON 2025.10.2.19¶
Bundle¶
org.apache.nifi | nifi-jolt-nar
Description¶
Applies a list of Jolt specifications to either the FlowFile JSON content or a specified FlowFile JSON attribute. If the JSON transform fails, the original FlowFile is routed to the ‘failure’ relationship.
Input Requirement¶
REQUIRED
Supports Sensitive Dynamic Properties¶
false
Properties¶
Property |
Description |
|---|---|
Custom Module Directory |
Comma-separated list of paths to files and/or directories which contain modules containing custom transformations (that are not included on NiFi’s classpath). |
Custom Transformation Class Name |
Fully Qualified Class Name for Custom Transformation |
JSON Source |
Specifies whether the Jolt transformation is applied to FlowFile JSON content or to specified FlowFile JSON attribute. |
JSON Source Attribute |
The FlowFile attribute containing JSON to be transformed. |
Jolt Specification |
Jolt Specification for transformation of JSON data. The value for this property may be the text of a Jolt specification or the path to a file containing a Jolt specification. ‘Jolt Specification’ must be set, or the value is ignored if the Jolt Sort Transformation is selected. |
Jolt Transform |
Specifies the Jolt Transformation that should be used with the provided specification. |
Max String Length |
The maximum allowed length of a string value when parsing the JSON document |
Pretty Print |
Apply pretty print formatting to the output of the Jolt transform |
Transform Cache Size |
Compiling a Jolt Transform can be fairly expensive. Ideally, this will be done only once. However, if the Expression Language is used in the transform, we may need a new Transform for each FlowFile. This value controls how many of those Transforms we cache in memory in order to avoid having to compile the Transform each time. |
Relationships¶
Name |
Description |
|---|---|
failure |
If the JSON transformation fails (e.g., due to invalid JSON in the content or attribute), the original FlowFile is routed to this relationship. |
success |
The FlowFile with successfully transformed content or updated attribute will be routed to this relationship |
Writes attributes¶
Name |
Description |
|---|---|
mime.type |
Always set to application/json |